New update of Firefox, now my home page keeps changing with each new session. What's the fix?

After Firefox performed an automatic upgrade, my home page and "Restore to Default" setting changed. I can input the correct URL and save and that works fine during that session. But when the browser is closed and brought back up again, it reverts to this different home page (my companies intranet page). I've tried changing the "home page default" setting in the browserconfig.properties file and did a find and replace of the wrong URL in the "pref.js" files. But it keeps going back to the wrong address each time a new browser session is started. This all happened after an automatic upgrade was done to bring Firefox to version 3.6.8.

This has happened on both of my work computers that run Windows XP - SP 3, IE 7.0.573 and Symantec Antivirus. So I'd think the chances of both computers being hit by the exact some problem, at the exact same time, changing the home page to the exact same URL and neither of the computers' antivirus protection catching it are rather slim. But I suppose that's a possibility. However, since this happened immediately following the browser upgrade, I have to think that this new installation has something to do with it.

Any suggestions?

After Firefox performed an automatic upgrade, my home page and "Restore to Default" setting changed. I can input the correct URL and save and that works fine during that session. But when the browser is closed and brought back up again, it reverts to this different home page (my companies intranet page). I've tried changing the "home page default" setting in the browserconfig.properties file and did a find and replace of the wrong URL in the "pref.js" files. But it keeps going back to the wrong address each time a new browser session is started. This all happened after an automatic upgrade was done to bring Firefox to version 3.6.8.
This has happened on both of my work computers that run Windows XP - SP 3, IE 7.0.573 and Symantec Antivirus. So I'd think the chances of both computers being hit by the exact some problem, at the exact same time, changing the home page to the exact same URL and neither of the computers' antivirus protection catching it are rather slim. But I suppose that's a possibility. However, since this happened immediately following the browser upgrade, I have to think that this new installation has something to do with it.
Any suggestions?

Have you contacted your IT department about that issue?
Maybe they are overriding your homepage setting?

Did you look for a '''user.js''' file in your Profile folder?
http://kb.mozillazine.org/User.js_file
Prefs in that file will override the same pref in the prefs.js file on each Firefox startup.
Have you contacted your IT department about that issue?
Maybe they are overriding your homepage setting?